What it means
A soil absorption field is the final treatment step in most septic systems. Effluent moves through unsaturated soil, where microbes break down remaining waste and filter bacteria.
Field size depends on daily flow, soil loading rate, and percolation test results. Compaction, paving, or deep roots in this zone reduce treatment capacity.
Why it matters in Santa Cruz County
Santa Cruz County absorption fields must stay above seasonal groundwater, which can rise dramatically in low areas near the Pajaro Valley and coastal flats.
Homeowner tip
Redirect roof runoff away from the absorption area so storm water does not saturate treatment soil.
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Related glossary terms
Also explore the Plumbing Glossary or call 831.225.4344 with questions about your property.